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    SubjectRe: [RFC] Splitting kernel headers and deprecating __KERNEL__
    On Nov 25, 2004, at 10:13, David Howells wrote:
    > We've been discussing splitting the kernel headers into userspace API
    > headers
    > and kernel internal headers and deprecating the __KERNEL__ macro. This
    > will
    > permit a cleaner interface between the kernel and userspace; and one
    > that's
    > easier to keep up to date.

    Yay!!! Finally!!!

    > ============= ==================
    > include/user/ include/linux/
    > include/user-*/ include/asm-*/

    How about include/abi for the platform-independent headers and
    for the platform-specific headers? Then include/arch would be
    symlinked to the
    correct arch-* directory.

    > Note that this doesn't take account of the other directories under
    > include/, but I don't think they're relevant.

    Perhaps such directories should either be broken out into
    pieces, or put into their own top-level directories.

    > (2) Take each file from the shadowed directory. If it has any
    > userspace
    > relevant stuff, then:

    Something like this would warn about incorrect uses of the linux/
    headers, yet
    still allow for a period of backwards compatibility. Once such period
    has passed,
    then linux/* would not even be installed, only abi/* and arch/*

    #ifndef _LINUX_FOO_H
    #define _LINUX_FOO_H 1

    #ifndef __KERNEL__
    # warning "Directly including <kernel/foo.h> is deprecated!!!"
    # warning "Please change your program to include <abi/foo.h> instead!!!"

    #include <abi/foo.h>

    #ifdef __KERNEL__
    /* Old __KERNEL__ contents of include/linux/foo.h */

    #endif /* not _LINUX_FOO_H */

    #ifndef _ABI_FOO_H
    #define_ABI_FOO_H 1

    #include <abi/bar.h>
    #include <arch/baz.h>

    /* Old non-__KERNEL__ contents of include/linux/foo.h */

    #endif /* not _ABI_FOO_H */

    Kyle Moffett

    Version: 3.12
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    ------END GEEK CODE BLOCK------

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